HP Evolving_data_center_architectures

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HP Evolving_data_center_architectures

  1. 1. Technology Insight Paper   Evolving Datacenter Architectures HP technologies for Cloud ready IT By Russ Fellows January, 2013  Enabling  you  to  make  the  best  technology  decisions      
  2. 2. Evolving Datacenter Architectures - HP Technologies 1©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  3. 3. Evolving Datacenter Architectures - HP Technologies 2OverviewCompanies  of  all  sizes  are  either  implementing  server  virtualization,  expanding  earlier  pilot  efforts,  or  exploring  how  to  begin  these  projects.    The  widespread  success  results  from  the  ability  to  improve  efficiency  while  lowering  capital  expenditures.    However,  limitations  with  current  generation  infrastructure  can  reduce  the  effectiveness.  As  a  result  of  these  successes,  the  discussion  has  moved  beyond  the  question  of  whether  or  not  to  deploy  virtualization.    Companies  increasingly  rely  upon  IT  systems  to  deliver  top  line  results,  while  updating  legacy  infrastructure  to  also  improve  bottom  line  profits.    As  a  result,  companies  want  to  increase  the  scope  of  IT  projects  to  deliver  business  results  with  shrinking  budgets.    Organizations  attempting  to  optimize  their  virtualization  deployments  or  those  building  next  generation  cloud  infrastructure  require  IT  components  that  help  this  transition.    Next  generation  IT  architectures  require  virtualized,  flexible  architectures  and  IT  components  that  help  IT  organizations  deliver  real  business  value.      Cloud  computing,  also  known  as  ‘IT  as  a  Service’,  is  predicated  on  delivering  IT  services  on  demand,  an  idea  that  has  support  from  business  leaders  as  a  way  to  better  align  IT  with  business  operations.    Cloud  computing  has  two  key  requirements:  virtualized  applications  and  seamless  support  and  integration  between  the  server,  networking,  storage  and  hypervisor  components.      In  this  paper,  we  explore  these  concepts  and  highlight  the  critical  features  necessary  to  move  beyond  server  virtualization  by  leveraging  key  integration  capabilities  between  IT  components—with  a  particular  focus  on  the  important  role  that  storage  plays  in  the  evolution  of  the  datacenter  architecture.  Business ExpectationsAcross  businesses  of  all  sizes,  IT  investments  can  provide  positive  business  results,  lowering  operational  costs,  while  improving  business  efficiency.    For  some  firms,  improved  efficiency  is  the  primary  goal  for  measuring  IT  success,  while  others  require  IT  to  increase  their  operational  capabilities,  without  significant  capital  or  operational  changes.      Businesses  expect  to  receive  a  return  on  their  IT  investment  in  a  number  of  tangible  areas,  including:   § Reduce  costs,  both  Capex  and  Opex   § Improve  availability  and  reduce  business  risk   § Accelerate  IT  service  delivery  in  support  of  business     ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  4. 4. Evolving Datacenter Architectures - HP Technologies 3Server  virtualization  has  proven  successful  for  all  of  these  objectives.    As  a  result,  companies  that  deployed  virtualization  in  targeted  areas  are  now  moving  entire  business  processes  to  architectures  that  can  further  enhance  their  operations.    Others  firms  that  are  beginning  to  implement  server  virtualization  are  able  to  leverage  the  knowledge  gained  from  early  adopters.    Both  groups  want  IT  architectures  that  will  support  their  companies’  objectives.  Many  smaller  firms  are  making  their  first  significant  investments  into  server  virtualization,  while  also  moving  some  applications  into  the  cloud.    These  companies  see  the  ability  to  operate  highly  efficient  IT  infrastructures  using  standard  components  and  IT  practices.    These  companies  want  to  leverage  early  adopters  knowledge  and  move  directly  to  IT  architectures  optimized  for  virtual  applications,  while  still  meeting  their  budget  and  operational  constraints.      Mid-­‐sized  companies  that  have  made  previous  investments  in  virtualization  are  now  looking  to  increase  the  number  of  virtualized  applications  significantly.    Next  generation  architectures  are  needed  to  provide  consolidation  of  infrastructure  and  management.    Another  objective  for  mid-­‐sized  business  is  implementing  disaster  recovery,  a  capability  that  requires  high  technical  sophistication  and  large  budgets  prior  to  server  virtualization.      Larger  enterprise  firms  may  be  consolidating  past  virtualization  and  networked  storage  investments,  or  expanding  their  scope  to  include  deploying  tier-­‐1  applications  in  a  virtual  infrastructure.    As  they  go  beyond  initial  deployments  these  organizations  are  moving  toward  cloud  delivery  of  IT  services  where  they  expect  to  deliver  enhanced  business  value  by  better  aligning  IT  with  business  needs.    Building A Cloud FoundationOne  of  the  tenets  of  Cloud  computing  is  that  infrastructure  is  abstracted  to  a  common  layer.    The  abstraction  to  a  standard  set  of  functions  is  accomplished  with  virtualization,  making  it  a  first  step  for  operating  IT  efficiently.      Industry  standard  servers  provide  an  architectural  foundation  for  building  cloud  delivery  infrastructures.    The  integration  between  components,  along  with  their  reliability  and  manageability  will  determine  how  effectively  this  infrastructure  is  managed.    Cloud  computing  will  require  still  more  integration  and  the  ability  to  run  virtual  applications  in  multi-­‐tenant  environments.  Another  trend  occurring  is  the  shift  in  responsibilities  of  IT  staff,  moving  from  technical  tasks  to  duties  that  better  align  IT  with  business  operations.    In  many  cases,  administrators  have  less  time  to  devote  to  managing  individual  products,  while  being  asked  to  manage  applications  and  all  supporting  infrastructure.    As  a  result,  many  administrators  now  utilize  application  management  interfaces  along  with  a  hypervisor  console  as  the  primary  means  for  managing  application  infrastructure.       ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  5. 5. Evolving Datacenter Architectures - HP Technologies 4Storage Technology for VirtualizationThe  basis  for  operating  and  delivering  IT  via  either  a  private  or  public  cloud  is  running  virtualized  applications  using  a  consistent  and  flexible  infrastructure  optimized  for  these  workloads.    Based  on  recent  deployment  information  from  server,  storage  and  hypervisor  vendors,  Evaluator  Group  has  found  that  over  50%  of  current  storage  systems  are  allocated  to  running  virtual  workloads.    As  a  result,  storage  systems  must  support  a  much  greater  and  more  diverse  set  of  applications  per  physical  system.      Supporting  multiple  workloads  is  a  task  traditional  dual  controller  storage  systems  were  not  designed  to  handle.    Virtual  applications  place  a  much  greater  demand  on  storage  systems,  generating  random  I/O  requests,  which  traditional  storage  systems  are  unable  to  support.    In  addition  to  the  high  performance  demands,  virtual  applications  can  exhaust  capacity  if  efficient  thin-­‐provisioning  capabilities  are  not  available.      Finally,  many  current  storage  systems  have  limited  hypervisor  integration,  creating  operational  inefficiencies  for  IT  staff.    As  a  result  of  these  restrictions,  IT  departments  have  found  that  the  benefits  of  server  virtualization  are  hindered  by  their  existing  storage  systems.      Next Generation StorageStorage  designed  for  next  era  of  IT  environments  have  features  that  differentiate  them  from  earlier,  general-­‐purpose  storage.    The  first  major  requirement  is  the  ability  to  deliver  high-­‐performance  for  the  highly  random  workloads  generated  by  applications  running  in  a  virtual  server  infrastructure.      Additional  storage  features  such  as  thin  provisioning,  scale  out  capabilities  and  integration  with  virtual  servers  all  help  improve  IT  efficiency.    Because  virtual  server  infrastructures  often  lead  to  a  proliferation  of  server  instances,  capacity  and  management  efficiency  become  even  more  critical  to  IT  efficiency.    Thin  provisioning  alleviates  wasted  capacity  overprovisioning,  while  scale-­‐out  and  hypervisor  integration  allow  IT  administrators  to  operate  their  infrastructure  more  efficiently.  Disaster  recovery  and  business  continuance  is  a  capability  that  once  seemed  out  of  reach  for  many  mid-­‐sized  firms  and  most  small  businesses.    However,  next  generation  IT  architectures  are  now  enabling  these  companies  to  implement  disaster  recovery  by  leveraging  their  scale-­‐out  systems,  with  the  ability  to  failover  to  collocated  facilities  or  DR  as  a  service  sites.      Effect of VAAIHypervisor  integration  is  an  important  criterion  for  storage  systems.    Next  generation  storage  systems  are  now  emerging  with  deep  management  and  hypervisor  offload  capabilities  that  go  beyond  the  early  “certification”  claims.    The  ability  to  offload  storage  operations  from  servers,  hypervisors  and  operating  systems  to  a  storage  device  is  feature  that  can  provide  dramatic  efficiency  and  performance  gains.       ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  6. 6. Evolving Datacenter Architectures - HP Technologies 5One  effort  to  provide  intelligent  links  between  hypervisors  and  storage  is  the  VMware  VAAI  (vStorage  APIs  for  Array  Integration)  specification.    This  API  enables  a  hypervisor  to  offload  critical  and  resource  intensive  operations  from  the  server  to  a  storage  system,  which  is  able  to  perform  the  offloaded  functions  faster  and  more  efficiently.    VAAI  offload  capabilities  include:   § Storage  array  assisted  locking  -­‐  eliminates  the  impact  of  hypervisor  administrative  operations   on  running  workloads   § Storage  array  clone  -­‐  significantly  reduces  the  server,  network  and  storage  overhead   associated  with  creating  clones  of  virtual  machines   § Storage  array  block  zero  -­‐  reduces  server,  network  and  storage  overhead  when  initializing   virtual  disks  for  vm’s   § Storage  UNMAP  -­‐  helps  preserve  the  space  efficiency  of  thinly  provisioned  virtual  disks  by   enabling  storage  systems  to  reuse  deleted  disk  blocks    As  shown  below  in  Table  1,  the  importance  of  VAAI  for  some  operations  is  significant.     VAAI Time SAN Hypervisor Benefits Primitive Reduction Reduction offload Allows array to zero-out large numbers of blocks, improving performance of VMBlock Zero 85% 94% 100% provisioning. Less resource overhead on vSphere hosts. Deployment time of VMs is reduced.Full Copy 95% 92% 100% Storage vMotion time reduced. Less resource overhead on vSphere hosts. Locking conflicts/contention between Hardware- vSphere hosts reduced. Scalability is Assisted 83% N/A N/A substantially improved. Creation of Locking larger VMFS volumes / datastore for clusters now possible. Table  1:  Effects  of  VAAI  on  Server  Resources  (Source:  HP  &  VMware)  VMware  was  first  to  offer  a  programmatic  interface  to  offload  specific  storage  intensive  operations  known  to  storage  systems  using  VAAI.    This  offload  concept  is  being  adopted  by  other  hypervisors  including  Microsoft  Hyper-­‐V  and  Citrix  XenServer,  which  are  now  developing  similar  offload  capabilities.       ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  7. 7. Evolving Datacenter Architectures - HP Technologies 6HP Converged Storage AdvantagesHP’s  storage  portfolio  includes  products  that  have  emerged  from  the  heritage  of  innovation  at  high-­‐growth  enterprise  storage  companies,  including  3PAR  (HP  3PAR  StoreServ  Storage),  LeftHand  (HP  StoreVirtual  Storage),  IBRIX  (HP  StoreAll  Storage)  and  HP  Labs  (HP  StoreOnce  Backup).    The  unique  technology  and  innovation  of  these  products  has  been  further  refined  to  provide  specific  features  that  help  deliver  business  benefits.      By  leveraging  common  components,  coupled  with  management  and  hypervisor  integration,  HP  Converged  Storage  delivers  business  benefits  outlined  below  in  Table  2.     HP  Converged  Storage  Feature   Business  Benefit   Enterprise  Availability   Decreases  risk,  by  providing  higher   availability  than  traditional  two  controller   architectures.  *                                                                             *(3PAR  StoreServ  &  StoreVirtual)       High  Performance   Lowers  Capex  by  providing  consistent  high   performance,  which  enables  more  virtual   applications  per  storage  system.   Thin  Provisioning  &  Persistence   Lowers  both  Capex  and  Opex  by  increasing   capacity  utilization  throughout  the  lifespan   of  the  asset.   Hypervisor  Integration   Reduces  both  Capex  and  Opex.    Capital   reductions  by  reducing  server  and  network   workloads.    Operational  efficiency  by   reducing  IT  administration  time  and   training.   Peer  Replication   Reduces  Opex  and  Capex,  by  enabling   disaster  recovery  with  lower  initial   deployment  costs  and  operational  costs.   Table  2:  Storage  Designed  for  Virtualization  HP’s  storage  products  establish  a  foundation  for  delivering  and  growing  IT  services  via  clouds  with  the  following  specific  capabilities:   ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  8. 8. Evolving Datacenter Architectures - HP Technologies 7 1. Tight  integration  with  virtualization  software  –  HP  Converged  Storage  is  integrated  with   VMware,  Microsoft  and  Citrix  software   2. Better  align  IT  costs  with  Business  -­‐  With  HP’s  ‘Pay  as  you  grow’  product  and  financing   options,  enabling  IT  consumers  to  scale-­‐out  and  match  cost  with  needs   3. Features  that  solve  virtualization  storage  problems  –  HP  Converged  Storage  addresses  the   performance,  availability,  scalability,  storage  efficiency  and  management  requirements   needed  for  virtualization  environments     4. Complete  systems  –  Reference  Architectures  and  HP  VirtualSystem  reduce  integration  issues   and  the  risk  of  architectural  incompatibilities,  resulting  in  decreased  time  to  business  value     5. HP  Converged  Storage  with  HP  servers  –  HP  Insight  Control  unifies  storage,  server,   networking  management  in  virtualized  environments,  improving  IT  operational  efficiency.     6. End-­‐to-­‐End  virtual  infrastructure  –  HP  is  able  to  provide  every  aspect  of  a  complete  solution;   starting  with  server,  network  and  storage  hardware,  together  with  IT  management  and  data   protection  tools,  integrating  these  components  into  disaster  protected  business  operations.      Operational EfficiencyOperational  efficiency  is  an  objective  for  firms  regardless  of  size.    Reducing  the  number  of  management  portals  is  one  practical  method  of  enhancing  efficiency.    For  many  firms,  the  hypervisor  console  has  become  the  primary  management  interface.    All  HP  Converged  Storage  systems,  including  the  StoreVirtual  and  StoreServ  products  utilize  a  common  set  of  hypervisor  management  plug-­‐ins,  delivering  a  consistent  management  experience  across  the  HP  portfolio.      Further  integration  with  leading  hypervisors,  including  VMware  and  Microsoft  Hyper-­‐V,  help  increase  operational  efficiency  and  reduce  workloads  on  server  and  network  components.    By  offloading  tasks  that  consume  significant  processor  and  network  capacity  to  storage  systems,  hypervisor  integration  can  reduce  overhead  as  shown  previously  in  Figure  1.      Another  benefit  of  increased  integration  between  HP  Converged  Storage  systems  with  virtual  system  management  is  the  ability  to  operate  IT  assets  more  effectively,  using  a  common  hypervisor  console  to  perform  the  majority  of  their  daily  tasks.    As  IT  personnel  manage  more  applications  and  operate  infrastructure  at  the  hypervisor  level,  their  efficiency  and  alignment  with  business  operations  improves.       ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  9. 9. Evolving Datacenter Architectures - HP Technologies 8HP Converged Storage PortfolioThe  current  HP  Converged  Storage  portfolio  has  been  enhanced  with  the  introduction  of  next  generation  architectures  designed  to  support  virtual  workloads.    In  contrast  to  legacy  architectures,  HP  server,  network  and  storage  systems  provide  integration  with  VMware  vSphere,  Microsoft  Hyper-­‐V  and  Citrix  XenServer.      Peer  node  replication,  multi-­‐tenancy,  stretched  clusters  and  hypervisor  based  storage  controllers  (VSA)  are  some  of  the  features  provided  by  HP  Converged  Storage  systems  that  are  helping  to  enable  businesses  to  move  beyond  past  limitations.      Individual  HP  Converged  Storage  products  offer  a  number  of  integration  points  with  several  hypervisors.    Some  features  include:   § VMware  vSphere,  MS  Hyper-­‐V  and  Citrix  XenServer  certification   § VMware  VAAI,  VASA,  SRM  and  vMSC  support   § MS  SCOM  /  SCVMM  support   § VMware  vCenter  management  integration  with  plug-­‐ins   § MS  System  Center  integration  with  plug-­‐ins   § Microsoft  Application  integration,  MS  VDS  and  VSS  support    HP 3PAR StoreServHP  3PAR  StoreServ  arrays  deliver  scalable  SAN  attached  storage  spanning  from  the  low  midrange  up  to  larger  enterprise  class  storage  systems.    Other  3PAR  StoreServ  innovations  such  as  wide-­‐striping,  zero  detect,  and  thin  persistence  all  help  deliver  business  value  by  enabling  better  IT  resource  utilization.      The  common  architecture  provides  complete  transparency  for  IT  staff  for  data  protection  operations.    Compatibility  between  midrange  and  enterprise  3PAR  StoreServ  systems  enables  a  variety  of  BC/DR  deployment  options.    This  unique  differentiation  helps  reduce  costs  by  allowing  companies  to  size  systems  based  on  needs  rather  than  requiring  expensive  tier-­‐1  systems  in  locations  in  order  to  achieve  business  continuity.  IT  staff  are  able  to  learn  how  to  operate  one  product,  rather  than  multiple  products.    This  also  improves  efficiency  of  operations,  while  reducing  business  risk  of  configuration  through  a  consistent  deployment  model,  reducing  risk  of  problems  or  outages.  Finally,  the  3PAR  StoreServ  products  provide  cost  savings  with  HP’s  “Get  Virtual”  guarantee  and  “Get  Thin”  guarantee,  enabling  2X  better  virtual  machine  density  and  50%  less  physical  capacity  than  competing  legacy  storage  respectively.       ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  10. 10. Evolving Datacenter Architectures - HP Technologies 9HP StoreVirtual StorageHP’s  StoreVirtual  storage  systems  have  unique  innovations  that  are  well  suited  for  virtual  environments.    Innovative  features  such  as  Network  RAID,  scale-­‐out  architecture  and  support  on  a  variety  of  physical  form  factors  (blade,  rack  and  VSA),  make  StoreVirtual  systems  a  natural  fit  for  many  virtual  server  workloads.  StoreVirtual  arrays  were  among  the  industries  first  storage  controllers  designed  to  operate  as  specialized  storage  applications  running  on  industry  standard  platforms.    This  approach,  known  as  software-­‐defined  storage  is  gaining  popularity  for  its  ability  to  utilize  common  hardware  components  for  server  and  storage  controllers.        HP’s  StoreVirtual  arrays  support  software  only  -­‐  Virtual  Storage  Appliance  (VSA)  versions  -­‐  that  enables  IT  departments  to  operate  a  converged  IT  environment.      Converging  the  IT  infrastructure  is  enabled  through  use  of  HP  standard  servers  and  blades,  supporting  HP  StoreVirtual  running  as  a  VSA  on  common  server,  network  and  hypervisor  environment.    As  a  result,  IT  resources  may  be  quickly  and  efficiently  repurposed,  scaling  out  compute  nodes  or  storage  controller  nodes  as  required  using  a  shared  hardware  infrastructure.      HP StoreOnce BackupData  protection  remains  one  of  the  most  IT  resource  intensive  operations  that  occur  daily.    IT  administrators  spend  a  significant  portion  of  their  time  managing,  monitoring  and  performing  data  protection  and  recovery  tasks.  Recovery  time  and  data  loss  translate  directly  to  businesses  bottom  lines  with  any  failure  often  highly  visible.    As  a  result,  the  task  of  protecting  data  is  one  of  the  most  critical  tasks  performed.      HP  StoreOnce  Backup  systems  are  the  industry’s  largest  scaling  single  system  for  performance,  enabling  companies  to  protect  and  recover  their  vital  information  quickly  and  cost  effectively.    Developed  within  HP  Labs,  the  HP  StoreOnce  Backup  line  provides  a  highly  cost  effective  method  of  protecting  critical  business  information,  while  still  providing  the  high  Recovery  Time  and  Response  Time  Objectives  businesses  now  demand.    HP VirtualSystemsHP  integrated  solutions  scale  from  small  business  configurations  up  to  large  enterprises.    These  reference  architectures  and  pre-­‐configured  systems  help  accelerate  deployment  of  new  equipment,  in  particular  for  companies  that  desire  standard  components  to  use  as  the  basis  for  their  next  generation  IT  infrastructure.      With  integration  between  server,  network  and  storage  components  performed  by  HP  architects,  many  common  design  and  deployment  issues  are  alleviated.         ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    
  11. 11. Evolving Datacenter Architectures - HP Technologies 10Final ThoughtsSupporting  competitive  business  operations  for  the  next  decade  will  require  innovation  in  how  IT  is  managed  and  delivered.    Next  generation  IT  environments  demand  new  architectural  and  operational  designs.  IT  foundations  require  flexibility,  reliability  and  cost  effective  performance.    Overprovisioning  server,  network  or  storage  capacity  is  no  longer  economically  feasible.      IT  efficiency  is  a  critical  component  to  a  company’s  overall  efficiency.    HP  StoreVirtual  and  HP  3PAR  StoreServ  provide  industry  leading  storage  platforms  that  help  IT  translate  business  objectives  into  practical  reality.       HP  3PAR  StoreServ  Storage  is  HP’s  most  scalable  line  of  midrange  and  enterprise  storage,  with   § best  in  class  availability,  connectivity  and  hypervisor  integration  capabilities  provide  increased   efficiency  utilization  and  performance,  yielding  bottom  line  business  results.   § HP  StoreVirtual  Storage    are  optimized  for  virtual  servers,  combining  deep  hypervisor   integration  with  flexible  deployment  capabilities  to  support  virtual  and  cloud  IT  services  cost   effectively.   § HP  StoreAll  provides  file  and  object  storage  optimized  for  high  performance  scale-­‐out   environments   § HP  StoreOnce  Backup  scale  from  small  remote  office  systems  to  the  industries  highest   capacity  and  highest  performing  backup  appliance,  while  helping  to  optimize  data  protection   through  20:1  data  reduction  capabilities   § HP  VirtualSystems  provide  pre-­‐integrated  configurations  that  may  reduce  configuration   complexity  for  companies  expanding  their  IT  infrastructure    Businesses  leading  the  adoption  of  virtual  applications  and  the  evolution  to  cloud  will  leverage  converged  IT  components,  running  virtualized  applications  all  integrated  and  managed  in  a  consistent  manner.    HP  Converged  Storage  systems  help  enterprises  deliver  on  their  business  objectives  by  improving  operational  efficiency,  enabling  these  businesses  to  compete  more  effectively.            About Evaluator GroupEvaluator  Group  Inc.  is  dedicated  to  helping  IT  professionals  and  vendors  create  and  implement  strategies  that  make  the  most  of  the  value  of  their  storage  and  digital  information.  Evaluator  Group  services  deliver  in-­‐depth,  unbiased  analysis  on  storage  architectures,  infrastructures  and  management  for  IT  professionals.    Since  1997  Evaluator  Group  has  provided  services  for  thousands  of  end  users  and  vendor  professionals  through  product  and  market  evaluations,  competitive  analysis  and  education.    www.evaluatorgroup.com  Follow  us  on  Twitter  @evaluator_group   ©  2013  Evaluator  Group,  Inc.    All  rights  reserved.    Reproduction  of  this  publication  in  any  form     without  prior  written  permission  is  prohibited.    

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